GlobMarble Natural White. Color Pack for Decorative Concrete - Xtreme PreCast Mix- 0.5 lb (0.23 kg) Natural White. Color Pack for Decorative Concrete - Xtreme PreCast Mix- 0.5 lb (0.23 kg) Concrete color additive packs are conveniently premeasured to individually tint any single bag mix in the SureCrete Design Products line. Pure, synthetic, iron oxide pigments containing no fillers that will affect the performance of the bag mix being tinted. ColorPacks are recommended to use with Xtreme PreCast Mix products: Xtreme Countertop Bag Mix White. SureStamp - Stamp Concrete Overlay. SureBond - Concrete Bonding Agent For Overlay. SureBroom - Broom Finish Concrete Overlay. Thin Concrete Overlay Micro Topping. For a regular concrete mixes we recommend to use Concrete Oxide Pigments